MDCB
QUESTIONS AND
ANSWERS
GRADED A+
Evatee 9/5/24 MDCB
,MDCB QUESTIONS AND ANSWERS GRADED
A+
For a 4-fld box techn, which of the following will deliver the lower dose to the
femoral heads? Answer - 100 SSD, equal dmax dose to all fields
SSD= less hot spots
Which of the following can be classified as indirectly ionizing radiaiton? Answer
- Photons
Also neutrons, x-ray and gamma rays
The presence of a shoulder on the survival curve of most mammalian cells
indicates which of the following? Answer - a reduced efficiency of cell killing at
low doses
When opposing lateral fields to the pharynx are abutted at midline to the
anterior field to the suproclavicular fossae, overdose in the cord may be
avoided by Answer - a small block over the cord in the inf post corner of both
lateral fields
In Photoelectric interactions Answer - the entire energy of the incident photon
is absorbed by the resulting electron
Film badges used for personnel monitoring contain filters that are used to:
Answer - fitler info about beam quality and energies
Giving too much radiation to which of the following can lead to xerostomia
Answer - base of tongue
, The inguinal lymph nodes are located at a depth of Answer - 2-18 cm from the
anterior skin surface and are dependent on the pt's size
The contrast resolution for a tx planning CT scan can be described as a Answer
- measure of the ability to detect objects with small differences in hounsfield
units
a small area of high density near the surface of hte pt would have the greatest
impact on the dose near the edge of the high density are with: Answer - a
single 20 MeV electron field
-^energy ^ surface dose
Mass attenuation coefficient depends on the Answer - thickness of the
material being atttenuated
The binding energy of the nucleus Answer - represents a mass defect in the
nucleus
-binding energy of nucleus is proportional to the stability of a nucleus
the value for the Ngas calibration factor for an ioniziation chamber will depend
on the: Answer - composition of the chamber wall
Which are the following descriptors of characteristic x-rays or brems radiation
is true? Answer - Characteristic x-rays are produced following ionization
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller EvaTee. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $18.99. You're not tied to anything after your purchase.